zone example.com/IN: journal rollforward failed: journal out of sync with zone
zone example.com/IN: not loaded due to errors.

While named isn’t running, remove the .jnl file for the example.com zone. It will be in the same directory as the zone files. Restart named and the error should be gone.

This error occurs if you have dynamic entries (say pushed by in by a DHCP server or other automatic mechanism) in a zone and then also change the zone files on disk (say deploying updates from a manual edit).

To prevent this in the future, freeze a zone before changing the zone file, then thaw after.